diff --git a/sphinx/application.py b/sphinx/application.py
index 6c0afa3e8..ec8e6ceec 100644
--- a/sphinx/application.py
+++ b/sphinx/application.py
@@ -964,6 +964,7 @@ class Sphinx(object):
         document.
 
         .. list-table:: priority range categories for Sphinx transforms
+           :widths: 20,80
 
            * - Priority
              - Main purpose in Sphinx